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LME49743
LME49743 Quad High Performance, High Fidelity Audio Operational Amplifier
Literature Number: SNAS442A
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LME49743
Quad High Performance, High Fidelity Audio Operational
Amplifier
General Description
Key Specifications
The LME49743 is a low distortion, low noise, high slew rate
operational amplifier optimized and fully specified for high
performance, high fidelity applications. The LME49743 audio
operational amplifier delivers superior audio signal amplification for outstanding audio performance. The LME49743 combines low voltage noise density (3.5nV/√Hz) and THD+N
(0.0001%) to easily satisfy demanding audio applications. To
ensure that the most challenging loads are driven without
compromise, the LME49743 has a slew rate of ±12V/μs and
an output current capability of ±21mA.
The LME49743's outstanding CMRR(106dB), PSRR(98dB),
and VOS (±0.15mV) give the amplifier excellent operational
amplifier DC performance.
The LME49743 has a wide supply range of ±4.0V to ±17V.
Over this supply range the LME49743’s input circuitry maintains excellent common-mode, power supply rejection, and
low input bias current. The LME49743 is unity gain stable.
The LME49743 is available in 14–lead TSSOP.
■ Power Supply Voltage Range
±4.0V to ±17V
■ THD+N (AV = 1, VOUT = 3VRMS,
fIN = 1kHz)
RL = 2kΩ
0.0001% (typ)
RL = 600Ω
0.0001% (typ)
■ Input Noise Density
3.5nV/√Hz (typ)
■ Slew Rate
±12V/μs (typ)
■ Gain Bandwidth Product
30MHz (typ)
■ Open Loop Gain (RL = 600Ω)
110dB (typ)
■ Input Bias Current
190nA (typ)
■ Input Offset Voltage
±0.15mV (typ)
Features
■
■
■
■
■
Easily drives 600Ω loads
Optimized for superior audio signal fidelity
Output short circuit protection
98dB (typ) PSRR and 106dB (typ) CMRR
TSSOP package
Applications
■
■
■
■
■
Audio amplifiers and preamplifiers
Professional Audio
Equalization and crossover networks
Line drivers and receivers
Active filters
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© 2009 National Semiconductor Corporation
300481
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LME49743 Quad High Performance, High Fidelity Audio Operational Amplifier
January 12, 2009
LME49743
Connection Diagram
30048101
Order Number LME49743MT
See NS Package Number — MTC14
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If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Supply Voltage
(VS = V+ - V-)
Storage Temperature
Input Voltage
θJA (MT)
Temperature Range
36V
−65°C to 150°C
Output Short Circuit (Note 3)
(Notes 1, 2)
140°C/W
TMIN ≤ TA ≤ TMAX
Supply Voltage Range
(V-) - 0.7V to (V+) + 0.7V
Continuous
Electrical Characteristics
Internally Limited
750V
175V
150°C
–40°C ≤ TA ≤ 85°C
±4.0V ≤ VS ≤ ± 17V
The following specifications apply for VS = ±15V, RL = 2kΩ, fIN = 1kHz,
and TA = 25C, unless otherwise specified.
LME49743
Symbol
Parameter
Conditions
Typical
Limit
(Note 6)
(Notes 7,
8)
Units
(Limits)
AV = 1, VOUT = 3VRMS
THD+N
Total Harmonic Distortion + Noise
RL = 2kΩ
RL = 600Ω
AV = 1, VOUT = 3VRMS
Two-tone, 60Hz & 7kHz 4:1
0.0001
0.0001
0.0002
% (max)
IMD
Intermodulation Distortion
GBWP
Gain Bandwidth Product
30
25
MHz (min)
SR
Slew Rate
12
9.5
V/μs (min)
FPBW
Full Power Bandwidth
VOUT = 1VP-P, –3dB
referenced to output magnitude
at f = 1kHz
ts
Settling time
AV = 1, 10V step, CL = 100pF
0.1% error range
1.2
Equivalent Input Noise Voltage
fBW = 20Hz to 20kHz
0.48
0.65
en
Equivalent Input Noise Density
f = 1kHz
f = 10Hz
3.5
6.4
4.5
in
Current Noise Density
f = 1kHz
f = 10Hz
1.6
3.1
nV/√Hz (max)
nV/√Hz
pA/√Hz
pA/√Hz
VOS
Offset Voltage
±0.15
±1.0
mV (max)
ΔVOS/ΔTemp
Average Input Offset Voltage Drift vs
40°C ≤ TA ≤ 85°C
Temperature
0.05
PSRR
Average Input Offset Voltage Shift vs
ΔVS = 20V (Note 9)
Power Supply Voltage
98
ISOCH-CH
Channel-to-Channel Isolation
fIN = 1kHz
fIN = 20kHz
118
112
IB
Input Bias Current
VCM = 0V
190
ΔIOS/ΔTemp
Input Bias Current Drift vs
Temperature
–40°C ≤ TA ≤ 85°C
0.05
IOS
Input Offset Current
VCM = 0V
VIN-CM
Common-Mode Input Voltage Range
CMRR
Common-Mode Rejection
ZIN
AVOL
–10V<VCM<10V
Differential Input Impedance
Common Mode Input Impedance
Open Loop Voltage Gain
0.0005
% (max)
10
MHz
μs
μVRMS
μV/°C
94
dB (min)
dB
dB
250
nA (max)
nA/°C
7
40
nA (max)
±13.2
(V+)–2.0
(V-)+2.0
V (min)
V (min)
106
98
dB (min)
30
kΩ
–10V<VCM<10V
1000
MΩ
–10V<VOUT<10V, RL = 600Ω
110
dB (min)
–10V<VOUT<10V, RL = 2kΩ
110
dB (min)
–10V<VOUT<10V, RL = 10kΩ
110
100
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3
dB (min)
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LME49743
Power Dissipation
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature
Thermal Resistance
Absolute Maximum Ratings (Notes 1, 2)
LME49743
LME49743
Symbol
Typical
Limit
(Note 6)
(Notes 7,
8)
RL = 600Ω
±12.4
±12.0
RL = 2kΩ
±13.0
RL = 10kΩ
±13.0
Parameter
Conditions
VOUTMAX
Maximum Output Voltage Swing
IOUT
Output Current
IOUT-CC
Short Circuit Current
ROUT
Output Impedance
fIN = 10kHz
Closed-Loop
Open-Loop
CLOAD
Capacitive Load Drive Overshoot
100pF
16
IS
Total Quiescent Current
IOUT = 0mA
10
RL = 600Ω, VS = ±17V
±21
Units
(Limits)
V (min)
V (min)
V (min)
±20
mA (min)
+30
–38
mA
mA
0.01
13
Ω
Ω
%
14
mA (max)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications
and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics
may degrade when the device is not operated under the listed test conditions.
Note 3: Amplifier output connected to GND, any number of amplifiers within a package.
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5: Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200pF cap is charged to the specified voltage and then discharged directly into
the IC with no external series resistor (resistance of discharge path must be under 50Ω).
Note 6: Typical specifications are specified at +25ºC and represent the most likely parametric norm.
Note 7: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: PSRR is measured as follows: VOS is measured at two supply voltages, ±5V and ±15V. PSRR = |20log(ΔVOS/ΔVS)|.
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LME49743
Typical Performance Characteristics
THD+N vs Output Voltage
VS = ±15V, RL = 10kΩ, f = 1kHz
30kHz BW
THD+N vs Output Voltage
VS = ±15V, RL = 2kΩ, f = 1kHz
30kHz BW
300481b6
300481b7
THD+N vs Frequency
VS = ±15V, VOUT = 3VRMS, RL = 2kΩ
80kHz BW
THD+N vs Output Voltage
VS = ±15V, RL = 600Ω, f = 1kHz
30kHz BW
300481b8
300481b0
THD+N vs Frequency
VS = ±15V, VOUT = 3VRMS, RL = 10kΩ
80kHz BW
THD+N vs Frequency
VS = ±15V, VOUT = 3VRMS, RL = 600Ω
80kHz BW
300481b1
300481b2
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LME49743
+PSRR vs Frequency
VS = ±15V, RL = 2kΩ, VRIPPLE = 200mVPP
+PSRR vs Frequency
VS = ±15V, RL = 10kΩ, VRIPPLE = 200mVPP
300481a1
300481a2
−PSRR vs Frequency
VS = ±15V, RL = 2kΩ, VRIPPLE = 200mVPP
+PSRR vs Frequency
VS = ±15V, RL = 600Ω, VRIPPLE = 200mVPP
300481a3
300481a7
−PSRR vs Frequency
VS = ±15V, RL = 10kΩ, VRIPPLE = 200mVPP
−PSRR vs Frequency
VS = ±15V, RL = 600Ω, VRIPPLE = 200mVPP
300481a8
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300481a9
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LME49743
CMRR vs Frequency
VS = ±15V, RL = 2kΩ, VIN = 200mVPP
CMRR vs Frequency
VS = ±15V, RL = 10kΩ, VIN = 200mVPP
30048190
30048189
Crosstalk vs Frequency
VS = ±15V, VOUT = 3VRMS, RL = 2kΩ
CMRR vs Frequency
VS = ±15V, RL = 600Ω, VIN = 200mVPP
30048191
300481b9
Crosstalk vs Frequency
VS = ±15V, VOUT = 3VRMS, RL = 600Ω
Crosstalk vs Frequency
VS = ±15V, VOUT = 3VRMS, RL = 10kΩ
300481c0
300481c1
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LME49743
IMD vs Output Voltage
VS = ±5V, RL = 2kΩ
7kHz/60Hz 4:1 SMPTE
IMD vs Output Voltage
VS = ±5V, RL = 10kΩ
7kHz/60Hz 4:1 SMPTE
30048195
30048196
IMD vs Output Voltage
VS = ±5V, RL = 600Ω
7kHz/60Hz 4:1 SMPTE
Output Voltage vs Supply Voltage
RL = 2kΩ, THD+N = 0.1%
30048163
30048197
Output Voltage vs Supply Voltage
RL = 10kΩ, THD+N = 0.1%
Output Voltage vs Supply Voltage
RL = 600Ω, THD+N = 0.1%
30048165
30048164
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LME49743
Supply Current vs Supply Voltage
Scope Photo
Small Signal
300481c4
30048185
Scope Photo
Large Signal, Non-Inverting
Scope Photo
Large Signal, Inverting
30048187
30048186
Power Bandwidth
Equivalent Input Noise vs Frequency
30048188
30048192
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LME49743
Open Loop Gain and Phase
vs Frequency
30048193
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DISTORTION MEASUREMENTS
The vanishingly low residual distortion produced by
LME49743 is below the capabilities of all commercially available equipment. This makes distortion measurements just
slightly more difficult than simply connecting a distortion meter to the amplifier’s inputs and outputs. The solution, however, is quite simple: an additional resistor. Adding this
resistor extends the resolution of the distortion measurement
equipment.
The LME49743’s low residual distortion is an input referred
internal error. As shown in Figure 1, adding the 10Ω resistor
connected between the amplifier’s inverting and non-inverting
30048122
FIGURE 1. THD+N and IMD Distortion Test Circuit
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LME49743
inputs changes the amplifier’s noise gain. The result is that
the error signal (distortion) is amplified by a factor of 101. Although the amplifier’s closed-loop gain is unaltered, the feedback available to correct distortion errors is reduced by 101,
which means that measurement resolution increases by 101.
To ensure minimum effects on distortion measurements,
keep the value of R1 low as shown in Figure 1.
This technique is verified by duplicating the measurements
with high closed loop gain and/or making the measurements
at high frequencies. Doing so produces distortion components that are within the measurement equipment’s capabilities. This datasheet’s THD+N and IMD values were generated using the above described circuit connected to an Audio
Precision System Two Cascade.
Application Information
LME49743
Capacitive loads greater than 100pF must be isolated from
the output. The most straightforward way to do this is to put
a resistor in series with the output. This resistor will also prevent excess power dissipation if the output is accidentally
shorted.
Application Hints
The LME49743 is a high speed op amp with excellent phase
margin and stability. Capacitive loads up to 100pF will cause
little change in the phase characteristics of the amplifiers and
are therefore allowable.
Noise Measurement Circuit
30048121
Complete shielding is required to prevent induced pick up from external sources. Always check with oscilloscope for power line noise.
Total Gain: 115 dB at f = 1 kHz
Input Referred Noise Voltage: en = VO/560,000 (V)
Flat Amp Voltage Gain vs Frequency
VO = 0dB, AV = 80.0dB, f = 1kHz
RIAA Preamp Voltage Gain,
RIAA Deviation vs Frequency
VIN = 10mV, AV = 35.0dB, f = 1kHz
30048129
30048128
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LME49743
Typical Applications
State Variable Filter
30048137
AC/DC Converter
30048138
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LME49743
2 Channel Panning Circuit (Pan Pot)
Line Driver
30048140
30048139
Tone Control
30048141
30048142
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14
LME49743
RIAA Preamp
30048103
Av = 35 dB
En = 0.33 μV
S/N = 90 dB
f = 1 kHz
A Weighted
A Weighted, VIN = 10 mV
@f = 1 kHz
Balanced Input Mic Amp
30048143
Illustration is:
V0 = 101(V2 − V1)
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LME49743
10 Band Graphic Equalizer
30048144
fo (Hz)
C1
C2
R1
R2
32
0.12μF
4.7μF
75kΩ
500Ω
64
0.056μF
3.3μF
68kΩ
510Ω
125
0.033μF
1.5μF
62kΩ
510Ω
250
0.015μF
8200pF
0.82μF
68kΩ
470Ω
500
0.39μF
62kΩ
470Ω
1k
3900pF
0.22μF
68kΩ
470Ω
2k
2000pF
0.1μF
68kΩ
470Ω
4k
1100pF
0.056μF
62kΩ
470Ω
8k
510pF
0.022μF
68kΩ
510Ω
16k
330pF
0.012μF
51kΩ
510Ω
Note 10: At volume of change = ±12 dB
Q = 1.7
Reference: “AUDIO/RADIO HANDBOOK”, National Semiconductor, 1980, Page 2–61
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LME49743
Revision History
Rev
Date
1.0
03/26/08
Description
Initial release.
1.01
01/12/09
Fixed a typo.
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LME49743
Physical Dimensions inches (millimeters) unless otherwise noted
Dual-In-Line Package
Order Number LME49743MT
NS Package Number MTC14
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LME49743
Notes
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LME49743 Quad High Performance, High Fidelity Audio Operational Amplifier
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